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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbd548e102a8ca4e3c536ee5b74fea890e2f4010cd4fc19a7287d19acd7e1e11' 
  AND token = 'HsezHV/MwH9wv5OR39xawN8Y/o2/WFIDalkSURRcvzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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