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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9cabeb2d26ef281a04df9fec11106f29e5c19ba8f99e765a7d7a01fa649730f' 
  AND token = 'q8Ly8Y6ntH2kkMOdnvtIb/cx9Z1QvFP1n0ZzBhugo3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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