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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40f9c776efe25f27242a2b46e64dcfcccd0056991da86a68ce58f0a68377a20a' 
  AND token = '+KL8y3u7Dr1JDOelb2vguqjGzR6PiggwpbLWqrAdATs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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