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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4309f05edd7859ede45a84d46dfc8c04e65ac5dcc4b58a5ce48bdce19c68da47' 
  AND token = 'dQMkQ3NG2D4mh/TsgiRvXf/rQ0jp2uCfWF8CKseUgII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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