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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4440ca59723752233e7d9685613c547752092ec8d81c399618d5b444cdbf04b' 
  AND token = 'qLNeRMwfPl7rhXbXpW80MnIeBUECjeKp+W8h7D2XkqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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