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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e24409c17b9f3c29bfbfc8de19818634c7448c99549335b24ae34dd59ed2fbb' 
  AND token = 'aq2/EfY457SQpfg0NSC+HrzmRSpxCIDmBayldmxELW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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