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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e98474e3952072146046f359f4bb996e276cd86709deb118324970724aef2ab0' 
  AND token = 'mQbA4HZqfbtoX6HISS0GifcFqQUh4sGTzKvgcYAvftU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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