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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd8df2152b50cd16016480629a2f8a5d7b5d03ef8a155fdd6443834d408f1e21' 
  AND token = 'SpyEP5/IPuox7qXrYt7Oi2zKyav7nqwC0JPCbRzqkO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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