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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31164eb6d8922721d23448328f95580f678d628178a1985a4b1cb4101f5d6d8f' 
  AND token = '5EkhWSdPuGdNduAEt8g9LtdIlS3zcl5oz35PK3iiF9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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