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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95f27c838758ddb8beca721144816603b029eddbb25790a56a8d46d322d34ca3' 
  AND token = '3anX3gjCTLE8YHo6AFnnfd4hcZ8CMyS6jOKLKHw7Nw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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