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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd870ba595004f1fee783cf4037fe1b57012a61763fdc29a356a170e4683ab608' 
  AND token = 'mWk3sV/ZD1Qs8H41zH6rRVTN53YSEJhWSjhvD9sI+Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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