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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea22c075d0674ea188b693350469859d182e16489cd5524a732a589c540150cd' 
  AND token = 'Hga+BdzAVF7EudjHfd/NZMBtocgt8oETrt9nfgez2sE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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