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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c77de848afea6872e414192c324d7f7a88c21c19024c06d44647e9cef9b16eda' 
  AND token = '1JKlUGQR2XvDk/Qh8eArj/+xmJwk9nm7KvjD03Om6qI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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