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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e18091681d6d9e031d9eb41f5660fdd4ba1439e3484c1fa334006e2be1fed7b' 
  AND token = 'im16MIJsZGpbWn28fe88Vtnu6Qo/HiotPdnZWqnXyb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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