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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48700d0e7bcf5f065ee66e2b79c0f773fe512b2cc795fba03493c309ef9cc0bf' 
  AND token = 'nZ+k9OKuufTlMq50c910hkiL4mi/cbVa5mXqkyWKNjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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