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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b259551582ee3e2e85ba26a2ed1bdd7cc6ef6f201cc20a29ed4ea46d48d5b724' 
  AND token = 'xtJ8BRdCRrR3boJw17VG0tNiKRJhsJwmJ2jsvyM1Wtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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