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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ef41d71d9219085085cf146b2c9f375c8ab06d23f4741649c66b64456b8701f' 
  AND token = 'G4lJwS3P5D900VAAbxG+THiQeu3Whi5hL40g/Qp4K9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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