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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a70521677001ef5e873c43d02901c73d5c81ea80424311ff65ac29598a283249' 
  AND token = '4drMpbdd6pVtbVw4pWIvJ+BQbAPWG4arj0Mmmdts9mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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