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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fd2be68defca631602cc7124666b3bb532e568f00f154b93209ff97ec6cc59d' 
  AND token = 'OmCXdy8f7Q+aP5KRigsVmZOhcBCJ/PNoN4+1N02h0YE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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