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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0913568824f8a3b0d5bae81a5766b63ee0607775f9b476667bec6f950ace26ff' 
  AND token = 'txneuAR99rov9Ez4DhBs44gpKjJhTjXVew354Z+tNaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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