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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cae7b62bd55a910816b2bc54813d756270579f3eab4daecee98a5dda69b8bcb9' 
  AND token = '36rPblQrE50mJG6vR4LDh+qgyb8AvzNonLL3/ZPARmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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