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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3105ae73ceaf9e70f6f3a8595042011102f34c2b98f70267039a5962f63bfe2' 
  AND token = 'BXNTDlZd4bhJ+zhFzchb4vWIVDlXU0soqXMq8Tee+Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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