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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53095ac2ac7a46d9d176a03bbdbdeb5691bc9401f395cf54bb46eb984fb3be30' 
  AND token = 'ZlXu4Gc/8CysaiCiBDXbD+GsQ3mFocHzjWha9cGgqNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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