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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ac5ef12e0571962c30787f9001c4e48257ef9c39fef6417e67b375fd4f8d243' 
  AND token = 'Tf9xAGzwynX6neFRUKvqVn++hijkPPGkM5eoouXakjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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