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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8ad6d0319071653d8ee068cd5eb0aac1e580e5d82a9f9acc8492fe17867fe83' 
  AND token = 'M8nvYdCZOqK0GdeZ5ICR4393Y9na62OrYecCZtuT59c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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