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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5d07c76226038f7cd58662bcb5977f03b260a084df222f6833181e0d7bf57ff' 
  AND token = 'd7/sUcd3TbHk6BRZ2Xt6zVuSPoGVr0FGw9euun1fA3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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