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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55a369be86399e5c72e2199d90c56157ce1d7a99bdb51cfebd2665505b82722f' 
  AND token = 'IVEmwfwe6QNzIM8oM60G72V+PeFkzDz7p4CrDVE2l44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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