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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c81bd631f2adba085d846f9504901606be3146cbd1b1243faf8411ba9fe90884' 
  AND token = 'ks3QvYefPans3RD8U7znUTUj7n6er+p66uGzLq7tIhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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