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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a766b61f8ee9365bf48a378ce113011bc6678876d873585c9e3003999e40eff' 
  AND token = '8TkCCV2mM0fafVgrAThH+vWssSG0UQu30ZrwchtDR2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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