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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '624de0b65d9ec11ed52ea10df31408189ee180891c423847412b4c7c8eb0a983' 
  AND token = 'jbKJwTg5sJZI4mxupC73qxKghd8zQ/bx6jBzgEQxi0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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