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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f788593ea0415fdbb867365391a16f0234f30b3ff04066ee819091d11db38a1e' 
  AND token = 'x8zlNJOpCEN1Ssb9kA3jyZWhmoy3FJyjxWEe2a2wnbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}