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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed3f21854dabaef354cfef2dd2ae5bfa46a3e1081ee4873daeb57211f0f01b5e' 
  AND token = '/unkma+hyX8XkQ+SrjE30OgWGyO9+F5ewwSnEcLwEdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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