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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fd128ddde74e3ad66e86db565d8d2df825321d6d2218d6d49a4e418d546c08c' 
  AND token = 'TsApOlqPYWeYezDDZIfv/oJ+DRwfwI6TFXuc6EMmxZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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