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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f223017b8713b879b4f4cf69debf8181bb6cd3631a85fb349981bfdfd8903e3' 
  AND token = 'Ub7b+GanguzdXTr3eGB8LVVl2CGkxqp0yy5BWErnlDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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