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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7b5a01124024a6375d83d7a1807308417e354709f84e222fd942955b41e383b' 
  AND token = '0r3y5DQt3MKWBYvMYrSq+R4fBek63yUXUN90iZhryBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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