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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f369c4073a2e1216b755b0e8c0a36be59de45a771d77e2337c7cf787e800bae5' 
  AND token = 'dHlqwo/0mWN+GoM/mEYXeyj9Gtzy53CLn8dV4Lpxi/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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