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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af6b9a248f9e541a6fbcc2d31467f191e5eb5ec5612c475f3096597a65b97463' 
  AND token = 'WyquHi6K+EEZudyAhB4KTaoyzx6OZ5GJ8b8u5RvtYMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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