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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3bae7e2f42e967d7f2971a81129f36f4aa18f2a392a71bcc47a6bf3efbce15a' 
  AND token = 'daR5iH8cL66+SaAv79nA0euwfthjADiFqL/vyLdI4Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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