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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45515a989b1fecf8d3e9b2a3f732190aa153d030fd69275eaac7c269e988631c' 
  AND token = 'k168e/f7Ek0z5+UdLWbj3BkZBO9P1wIyrZ+mF2zEPSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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