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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70f6d049b6891b1fff1beb82864a48d67debf79cf3a728f8682d10b01204cbad' 
  AND token = '0j/xjpdvhENXnuPQzxaMywR/IH9okqb3O8ig/COVDuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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