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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da18dfe7aa96821286c16bb0e0ff73ab034c490def6094d5fe18103ef6c707d8' 
  AND token = '0KmiHXX0YhnTkHr1GrBJ26W1+DLluK+DST8u3UA6DgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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