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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82f374013deea32c34ba386389ec96203c20381b6963a010a63166546f618913' 
  AND token = '4lAA4r5sUoN4zuwA1XwuZufXLJ/mg3+LRKmjREd08RQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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