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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a30e5649f8fea44ab1902612ae604c7e8bfb693077f79e47097fa61d095e657f' 
  AND token = 'yX98xR5jLEhNZQpZKzpragMQeUTGU7AS7GGCBE2D+3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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