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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43c5b2bb4584b8b2cf7ffbd765c44a7cb4eb2bcc60b1ab999919884df99c34af' 
  AND token = '44nWHD90T5VZaCWL6QnaE6eFu4qiey/BUF4cKdyhC+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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