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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ecace73a77fc148a28cd7e67edfb2403a13a7c016051661cc1ad0de68972c4e' 
  AND token = 'FZ32FgGhSOPb9WmQp4vr9ark3tF5neeAYbZ05PeGoes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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