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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0a6807b87d6148da7003af14558e94e37affffb34db18536e4f5646e79ed743' 
  AND token = '8aLqtRvQoBVBO0so3NDPWbEy5vWg0M0cyWE1UW4ls68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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