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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5cd306f435b37d9390e7d81351b66e0f8411c54ea181cfc36c80f26e3c9cec7' 
  AND token = 'As7o6BI7eL8xECgggykepsGohNKYPd+iWYW8u6k8jy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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