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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ccbfe2a636568545ba2a32faf1fcc53d66e5682c705bd667d1b573d67c34dfe' 
  AND token = '5NrAFvyAzRI9R4DARJo8NNWxeh3xeqoCgr7XpbxXWbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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