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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b402e5b1ae568e303ffa6f08411f0cf261f20edf42afc05174a4579c2476d04b' 
  AND token = 'DmP4OeoukXJSlTitomVQhgCXN8Jgn22dccBAky4XwBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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