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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'decd37105b98b8ad8c99ebd6906a5bbb954be7092cd5dcc79f625c45fc889e42' 
  AND token = 'cur4Chr8xJvLX6b4famHqNnijnIkeIvu/wjdJggyNQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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