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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '276494ccd7307772332b4da8a331212978665b7847dcc02a54ec3e45cb159923' 
  AND token = 'ZvbwHGoSCxXfWiduFhP7eOuCP30lDNXOJJY2kiOEjBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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