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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caaed7a07670d68fff853db367672f9abed42c53e1b5eb55d51097589405cfea' 
  AND token = 'uAg5TV906kS23FJKxzzsQ4+GHd8Jtfnx9UZtUtYhPKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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