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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87bacc8e48345ec27ca4bb28262714a920a3fdf2154e9cc7402e2078ba8a964e' 
  AND token = 'fALAXhhhtvRRFEkJVluEgbXw41MPE2MQEW98P6b/UnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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