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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fdaa50cac63cb519a835179c3f0abf9b6921b35371323ecb79a0ae1d0c454e1' 
  AND token = '9u6agvvlNf4gube7eRHMZG9b3nbNdwF/HYrML1wiZFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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