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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a84c4de81049e0ea5dc812d555ef8339803541649555940e2985fb190dbbdbf9' 
  AND token = 'dysiniP6D2JkjfuH0r0z0ph4T1Cvgnb8dlP83/viVvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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