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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbf48b40f515d5299ac0b9eec0396173762d9f779fe11c21a5fe6bbdc179cff2' 
  AND token = 'YtrZnLZcXcd58Ter1oT+IFKJzxfM+ACheQdOS5lNIao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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