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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7023c458b8bd00ac221aed8c200ff484ed34ab612effbb6874ed936193bba9a8' 
  AND token = 'pTuHpodUT8dOuaTFYiXNqaQc/o6R0EmZIfax8hXQYtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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