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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b5de3f76560831a0e4d975c93b5b77e947c221551038e54885810205ff762d3' 
  AND token = 'Ztmq1R0044Mi7ajHGHPnFiERyU6fmyJ4XfDXmOJ8Zu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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