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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5be469c9c1de6a1f5f8ea0ad48b6a4ffd2a94db2a455a400a035ddcac436a83' 
  AND token = 'E6+5L9rVOKmpa0eMTkd6/GgFARyphOKPk2A6Z76SmEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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