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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '573df2369ffe2837f837757f8ce8dc8c5a6a8c7aaa7d2597f5592a130b6ce14e' 
  AND token = 'RkE1VV6UVgLSX3kTbIhCUu1VAdFHTHIkStY8WWXuLsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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